exam Maths Puzzle Numerical Ability

A rectangular garden is to be surrounded by a walkway of constant width. The garden's dimensions are 30ft by 40ft. The total area, garden plus walkway, is to be 1800ft^2. What must

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If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days? How can I find the vertex while using the quadratic formula?